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UPSC CDS Math Area and Perimeter Questions
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© examsnet.com
Question : 1
Total: 116
The area of a sector of a circle of radius 4 cm is
25.6
c
m
2
. What is the radian measure o f the arc of the sector ?
[2019 CDS-II]
2.3
3.2
3.3
3.4
Validate
Solution:
If the radian measure of the arc is
θ
, then the area of the
arc
A
=
π
r
2
(
θ
2
π
)
=
r
2
θ
2
Here,
25.6
=
1
2
(
4
)
2
θ
⇒
θ
=
25.6
8
=
3.2
[
r
=
4
c
m
]
© examsnet.com
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